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Old 01-22-2011, 09:02 PM   #1 (permalink)
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FRONT END BOUNCE AT HIGH SPEEDS

My 2011 F250 front end will shake or bounce if I hit some rough roads at highway speeds. It's almost like the tires go totally out of round. I have to slow down or pull over until it stops, then get back up to speed again. It does not happen very often. It did it once with my shop foreman although not as bad as it had before. My foreman said the tires had 10psi too much and we lowered them down to the recommended 65psi. He said there has been a bulletin out for over/under inflation. This helped some, but a week later I was going into a curve and hit some bumps. The front started to bounce and almost walked me into an 18 wheeler in the next lane. It scared the **** out of me. I had to pull over and slow down, then resume. Next visit they pulled the front suspension parts and checked them for any wear or out of spec parts. All was good and they replace my shocks with heavier duty units, and said the stabilizer was ok.
The shaking did happen again, although not as bad. Their next move is this Monday to check the alignment and compare it to the new trucks on the lot. I was told if that was not out, they were probably going to replace all the factory Michelins. Since I am planning to travel out of town this weekend, I decided to go ahead and replace the tires with some BFG A/T KO's. 285-65-20's. I normally put these on my trucks when I buy them. I can already feel a big difference in the handling. The smaller pot holes and rough spots don't feel nearly as unstable. I am assuming this was my issue all along. I heard from the tire store of three other people with the exact same problem I had/have. I still need more time to see if it will happen again, but has anyone experienced this yet??

Thanks
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Old 01-22-2011, 09:44 PM   #2 (permalink)
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Interesting - wonder if the other trucks that have "Da Bounce" have Michelin's as well?
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Old 01-23-2011, 06:50 AM   #3 (permalink)
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Out of the three trucks I have had, the one with the 20" Michelins was the worst handling. The steering over bumps would feel sloppy at times. Almost like my older truck with the 44" tires... The next truck I had with teh 18" Conti's felt a lot better as did the ones with the 18" I test drove on the lot. I didn't have a choice in tire size as my options forced the 18" anyways...

My new one, which only has 121 miles on it, has 18" Michelins... So we will see. It hasn't done it yet, but not a lot of chances in only 121 miles.
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Old 01-23-2011, 07:42 AM   #4 (permalink)
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I have a similar problem that just started after a tire rotation. Also have the Michelins. Right after the rotation, traveling on a road that I use daily, the front right started bouncing at 55 MPH when I hit a certain bump.

I didn't see any balancing weights on the outside of the rim, but looked at the inside and had one there, so I have to assume that the tire was balanced. I am going to recheck the tire pressures this morning take a drive to that spot where it always occurs and see what happens.
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Old 01-23-2011, 09:25 AM   #5 (permalink)
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The 'static' balanced the tires, which means no weights on the outside aluminum rim. Might have to get the full balance or even road balanced - more expensive but worth it in the ride department.

This is not your typical garage auto shop balance though. If you noticed when you picked up the truck and washed the tires for the first time there were marks on the side of the tire and rim, usually the weights on the outside of the rim where next to it too. That is because that is where the run out of tire and rim cancel each other out the best. (Rims and tires are never perfectly round and obviously not perfectly balanced) They are matched when mounted and then balanced. This is the basic description.

I am trying to remember the company that specializes in balancing tires this way. Their description and reasoning is much better than mine.
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Old 01-23-2011, 05:07 PM   #6 (permalink)
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Quote:
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I am trying to remember the company that specializes in balancing tires this way. Their description and reasoning is much better than mine.
Is this what you were looking for?

Hunter GSP9700 Wheel vibration Control System solves wheel vibration and tire pull problems that balancers and aligners can?t fix
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Old 01-23-2011, 05:10 PM   #7 (permalink)
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That would be it...
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Old 01-23-2011, 07:07 PM   #8 (permalink)
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Road force balance needed here...
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Old 01-23-2011, 07:35 PM   #9 (permalink)
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Adobe,
That is exactly when I noticed mine starting to happen. It was there before, but never got to the point of where it is/was now until they rotated the tires. This is not a balance issue. The tires are balanced fine. It's only when you hit some small to medium uneven bumps at highway speeds the tires will start literally bouncing. I'm only talking about the front of the truck, not the rear. Since changing the tires yesterday, I have already noticed a big difference to the point that I am willing to almost say it was the tires. I go in tomorrow for the alignment and will discuss this with them. The Mich's had 22K on them when I pulled them yesterday. I have them at my warehouse and they look almost over half gone on the tread life. Not a good thing and I'll bet the tires are bad. I think the sidewall is too light for this type of truck. My next step is to make Ford reimburse for the bad tires. It's on the possible list of things to look at, but I did it before they offered. Hope they won't give me any trouble about it.
Let's see how it goes. Obviously, I need more drive time to know if the problem is corrected now, but this weekend I'll be travelling about 600 miles and should be a pretty good indicator if I still have an issue. I'll keep you guys posted on the outcome including the reimbursement.
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Old 01-23-2011, 09:15 PM   #10 (permalink)
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check out "death wobble" on youtube.
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Old 01-24-2011, 06:03 PM   #11 (permalink)
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Adobe,
That is exactly when I noticed mine starting to happen. It was there before, but never got to the point of where it is/was now until they rotated the tires. This is not a balance issue. The tires are balanced fine. It's only when you hit some small to medium uneven bumps at highway speeds the tires will start literally bouncing. I'm only talking about the front of the truck, not the rear. Since changing the tires yesterday, I have already noticed a big difference to the point that I am willing to almost say it was the tires. I go in tomorrow for the alignment and will discuss this with them. The Mich's had 22K on them when I pulled them yesterday. I have them at my warehouse and they look almost over half gone on the tread life. Not a good thing and I'll bet the tires are bad. I think the sidewall is too light for this type of truck. My next step is to make Ford reimburse for the bad tires. It's on the possible list of things to look at, but I did it before they offered. Hope they won't give me any trouble about it.
Let's see how it goes. Obviously, I need more drive time to know if the problem is corrected now, but this weekend I'll be travelling about 600 miles and should be a pretty good indicator if I still have an issue. I'll keep you guys posted on the outcome including the reimbursement.
I checked the air pressure yesterday and actually aired the front tires up a bit. The "bounce" was noticeably harsher.

Maybe the reason that this does not make sense to me is that there is apparently more weight on the front tires and it would seem that it would compress the tires and produce a more favorable ride and less bounce.

I didn't notice a "rear end bounce" (where the tire was) prior to the rotation.

My plan is to reduce the pressure on the front tires tonight and check it again tomorrow. Then if it still bounces I am going to rotate them again.

If we look at the recommended rotation pattern, for a 4X4, I will end up with the original front left tire on the front right (and visa versa).

After all of that I will take it to the dealer and have them do what they need to in order to eliminate the problem. It seems obvious that this is a result of the tires/rims rather than suspensions -- based on the fact that it did not happen prior to the rotation.
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Old 01-24-2011, 10:11 PM   #12 (permalink)
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Here is exactly what my truck is doing. Watch the entire video towards the end. You can see it from outside, but it's the video inside the truck that really shows it well.

If the link does not pull up, go to youtube and look up F250 Death Wobble.
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Old 01-24-2011, 10:22 PM   #13 (permalink)
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Just sayin ive had that same problem on acouple customers trucks especially 08 to 11s and its caused by too much camber/caster but if u do get the allignment and its all in the green replace the steering stabilizer and ull be good to go
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Old 01-25-2011, 02:14 PM   #14 (permalink)
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Replace the shock on the steering linkage. I`ve felt that what you are experiencing.I put on blilstens and it went away. GOOD LUCK
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Old 01-25-2011, 08:11 PM   #15 (permalink)
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In case you didn't read my earlier thread, shocks were replaced with newer heavy duty units. Stabilizer was replaced and it just came back from the shop where the alignment checked out. I should have to do absolutely nothing to this truck to make it drive like it's supposed to from the factory. I believe it's the tires honestly. Since mounting the new tires, it's been running exactly like it should. I'm headed out of town this weekend and will see how it rides. I'll know by the time I rack up 800 miles if it will do it or not, but I feel confident the new rubber fixed it. Submitted a claim to Ford today for the tire reimbursment. I'll see how that goes. Claim department said they would review it and respond. If they refuse, I plan to put the old rubber back on, drop it at their shop, and tell them I don't want it back until it's fixed or pick up a new truck.
Let's see how they treat a long term customer that buys a new truck almost every year. First time I have ever had a problem like this with either Fords or my Duramax trucks.
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